New insights into reovirus evolution: implications from a newly characterized mycoreovirus

文献类型： 外文期刊

第一作者： Liu, Lijiang

作者： Liu, Lijiang;Cheng, Jiasen;Fu, Yanping;Jiang, Daohong;Xie, Jiatao;Liu, Lijiang;Liu, Huiquan

作者机构：

关键词： Sclerotinia sclerotiorum;mycoreovirus;horizontal gene transfer;reovirus evolution

期刊名称：JOURNAL OF GENERAL VIROLOGY （ 影响因子：3.891； 五年影响因子：3.719 ）

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年卷期：

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收录情况： SCI

摘要： We performed molecular cloning and complete genome sequencing of a novel mycoreovirus, Sclerotinia sclerotiorumreovirus 1 (SsReV1), isolated from an isolate of the phytopathogenic fungus Sclerotinia sclerotiorum. SsReV1 has a genome of 28 055 bp and is composed of 11 double-stranded RNA segments. With a combination of unique molecular features, virion shape and composition, and phylogenetic analysis, SsReV1 is significantly distinct from all known reoviruses and defines a novel genus in the family Reoviridae. Interestingly, two conserved domains, double-stranded RNA binding motif (dsRBM, Pfam 00 035) and reovirus sigma C capsid protein (Reo_sigma C, pfam04 582), were identified in the genome of SsReV1, which are widespread in diverse virus lineages. Sequence comparison and phylogenetic analysis revealed that multiple cross-family horizontal gene transfer (HGT) events could occur between reoviruses and double-stranded DNA viruses, single-stranded RNA viruses and even cellular organisms. Interestingly, the dsRBM of SsReV1 was phylogenetically related to dsRNA-binding proteins of some insects, but not reoviruses. These results indicated that SsReV1 is a new taxonomic representative in Reoviridae, which provides new insights into the diversity and global ecology of reoviruses and other segmented double-stranded RNA viruses. More importantly, the present results provided evidence indicating that reoviruses indeed have HGT events with other virus lineages on a large scale and that HGT may serve as an important driving factor that plays a key role in the evolution of reoviruses.

分类号： R37

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